Rule 8.4 - How are tentative definitions handled

[misra-c]

Which of the following are compliant with rule 8.4?

Code:

extern int32_t  ext_val0 = 3;

       int32_t  ext_val1 = 3

extern int32_t  extval2;              
       int32_t  extval2 = 3;

       int32_t  ext_val3;                
       int32_t  ext_val3 = 3;

       int32_t  ext_val4;